He took 6th at Eisenach 1896 (Hauptturnier), took 2nd at Annaberg 1897, tied for 7-8th at Berlin 1897, and tied for 3-6th in Amsterdam. After this he played in several major tournaments. In 1904, he tied for 1st-2nd with Frank Marshall in Monte Carlo (Rice Gambit theme tournament).
In 1904, he tied for 1st-3rd with Curt von Bardeleben and Carl Schlechter in Coburg (14th Dictionary of Scientific Biography Congress).
In 1905, he took 2nd, behind Leo Fleischmann in Barmen (B tourn). He committed suicide shortly after his 31st birthday allegedly because he could not face an operation.
Although many reference books refer to his death date as August 12, 1909, the Washington Post for that morning contained an August 11 dispatch of his death. The Trenton (New Jersey) Evening Times of August 11, 1909, reported "The body of M. Swiderski, the noted chess player, who committed suicide on August 2 was found today in the room where he had poisoned himself and then fired a bullet into this head
The body was badly decomposed.
The date of the suicide was determined by a note left by Swiderski. Swiderski was recently convicted of perjury in a trial that involved him in a disgraceful scandal.".